CEMS和慢正电子束研究ZrO2(Y)中Fe的热动力学行为

用内转换电子穆斯堡尔谱（ＣＥＭＳ）和慢正电子束研究了含３％Ｙ₂Ｏ₃的ＺｒＯ₂中⁵⁷Ｆｅ离子（１００ｋｅＶ，３×１０¹⁶ａｔ．／ｃｍ²）注入态及其在氢气氛中退火的热力学行为．注入态以Ｆｅ³⁺，Ｆｅ²⁺和Ｆｅ⁰存在，它们分别是Ｆｅ³⁺-Ｖ（空位）复合体、二聚体和超顺磁颗粒．经４００，５００℃退火后，Ｆｅ³⁺-Ｖ分解，分别出现了α-Ｆｅ的前期相和α-Ｆｅ纳米颗粒．含Ｆｅ的ＺｒＯ₂（Ｙ）混合导电的出现可能是和Ｆｅ的不同价态及其相对含量有关关键词：

THERMODYNAMICAL BEHAVIOR OF 57Fe IMPLANTED IN ZrO2(Y) BY CEMS AND SLOW POSITRON BEAM

By using conversion electron M?ssbauer spectroscopy (CEMS) and slow positron beam Doppler broading spectrum,the behaviour of the ⁵⁷Fe implanted (100keV,3×10¹⁶ at./cm²) ZY_x contained Y₂O₃ has been studied.The states of Fe⁰,Fe²⁺ and Fe³⁺ ions were obtained from CEMS for as implanted samples.After annealing at 500℃,metallic iron particles α-Fe, were formed at expense of other components. From the S-E curve of the ⁵⁷Fe as implanted sample,it was found that a large amount of cationic vacancies were distributed in a region of 0—50nm in ZY₃.These vacancies disappeared largely after annealing at 500℃.Therefore the parameter S provided an evidence to identify the iron sites in the implanted sample.The ZY₃ appeared mingle conducting property at 300℃.It probably correlates with different iron charge states,especially with that of Fe⁰.
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